{
  "manageEntity": {
    "action": "Save",
    "entityId": "541435395",
    "entityType": "Track",
    "nonce": "0xa94ea118383f9e454f16e0aeeb3a28b8436199c9f824b2f15cded25618533fb9",
    "signature": "0x601ee44c0d1af471b6774b8d35bf3c9f0c300ead6973d8fd275415f2aa5adf1a11666d9b049d7192adc7d987b3d9780f5aca29c5bd70a2218a648a207b40ee971c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}